Interface PrintOperation.CustomWidgetApplyCallback

All Superinterfaces:
FunctionPointer
Enclosing class:
PrintOperation
Functional Interface:
This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public static interface PrintOperation.CustomWidgetApplyCallback extends FunctionPointer

Functional interface declaration of the CustomWidgetApplyCallback callback.

See Also:

  • Method Details

    • run

      void run(@Nullable Widget widget)

      Emitted right before ::begin-print if you added a custom widget in the ::create-custom-widget handler.

      When you get this signal you should read the information from the custom widgets, as the widgets are not guaranteed to be around at a later time.

    • upcall

      default void upcall(MemorySegment sourcePrintOperation, MemorySegment widget)
      The upcall method is called from native code. The parameters are marshaled and run(Widget) is executed.

    • toCallback

      default MemorySegment toCallback(Arena arena)
      Creates a native function pointer to the upcall(MemorySegment, MemorySegment) method.
      Specified by:
      toCallback in interface FunctionPointer
      Parameters:
      arena - the arena in which the function pointer is allocated
      Returns:
      the native function pointer